Before you gcse science coursework rates of reaction take your exam! 1 I celebrate myself. Hong Kong. A secondary school revision resource for AQA GCSE Additional Science about chemical reactions, energy changes, rates of reaction and reversible reactions. A secondary school revision resource for AQA GCSE Additional Science about chemical reactions, energy changes, rates of reaction and reversible reactions. In order to get maximum marks in this coursework it is vital that you discuss all factors which affect the rate of a reaction. These include: Temperature.